public class Main {

    public static void main(String[] args) {
        Integer a = 1;
        Integer b = 2;
        Integer c = 3;
        Integer d = 3;
        Integer e = 321;
        Integer f = 321;
        Long g = 3L;
        Long h =2L;

        System.out.println(c == d);                 //  true
        System.out.println(e == f);                 //  false
        System.out.println(c == (a + b));           //  true
        System.out.println(c.equals(a + b));        //  true
        System.out.println(g == (a + b));           //  true
        System.out.println(g.equals(a + b));        //  false
        System.out.println(g.equals(a + h));        //  true
    }

}
